Mitsubishi Galant (2004+). Manual - part 930

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

13A-537

STEP 2. Check the continuity at knock sensor harness 
side connector B-120.

(1) Disconnect the connector B-120 and measure at the 

harness side.

(2) Check for the continuity between terminal No. 2 and 

ground.

• Should be less than 2 ohms.

Q: Does continuity exist?

YES : Go to Step 3.
NO :  Repair harness wire between knock sensor connector 

B-120 (terminal No. 2) and ground because of open 
circuit or harness damage. Then go to Step 6.

AK303856

1

2

AB

CONNECTOR: B-120

KNOCK SENSOR

B-120 (GR)

HARNESS 
CONNECTOR:
COMPONENT SIDE

INTAKE 
MANIFOLD

INTAKE 
MANIFOLD

AKX01415

2 1

B-120 HARNESS
CONNECTOR:
COMPONENT SIDE

AU

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

13A-538

STEP 3. Check harness connector B-21 at PCM for 
damage.

Q: Is the harness connector in good condition?

YES : Go to Step 4.
NO :  Repair or replace it. Refer to GROUP 00E, Harness 

Connector Inspection 

P.00E-2

. Then go to Step 6.

AK303018

55

56

54 53 52 51

57

62 61 60 59 58

63

69 68 67 66 65 64

70

75 74 73 72 71

76

82 81 80 79 78 77

83

CONNECTOR: B-21

PCM

AB

HARNESS CONNECTOR: 
COMPONENT SIDE

AIR CLEANER

B-21 (B)

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

13A-539

STEP 4. Check for open circuit and short circuit to ground 
and harness damage between knock sensor connector 
B-120 (terminal No. 1) and PCM connector B-21 (terminal 
No. 59).

Q: Is the harness wire in good condition?

YES : Go to Step 5.
NO :  Repair it. Then go to Step 6.

AK303856

1

2

AB

CONNECTOR: B-120

KNOCK SENSOR

B-120 (GR)

HARNESS 
CONNECTOR:
COMPONENT SIDE

INTAKE 
MANIFOLD

INTAKE 
MANIFOLD

AK303018

55

56

54 53 52 51

57

62 61 60 59 58

63

69 68 67 66 65 64

70

75 74 73 72 71

76

82 81 80 79 78 77

83

CONNECTOR: B-21

PCM

AB

HARNESS CONNECTOR: 
COMPONENT SIDE

AIR CLEANER

B-21 (B)

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

13A-540

STEP 5. Check the knock sensor.

(1) Disconnect the knock sensor connector B-120.
(2) Start the engine and run at idle.

(3) Measure the voltage between knock sensor side connector 

terminal No. 1 (output) and No. 2 (ground).

(4) Gradually increase the engine speed.

• The voltage increases with the increase in the engine 

speed.

(5) Turn the ignition switch to the "LOCK"(OFF) position.
Q: Is the sensor operating properly?

YES : Replace the PCM. Then go to Step 6.
NO :  Replace the knock sensor. Then go to Step 6.

AK303856

1

2

AB

CONNECTOR: B-120

KNOCK SENSOR

B-120 (GR)

HARNESS 
CONNECTOR:
COMPONENT SIDE

INTAKE 
MANIFOLD

INTAKE 
MANIFOLD

AK303857

1 2

AB

KNOCK SENSOR 
CONNECTOR